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usb: gadget: uvc: improve sg exit condition

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commit aef11279888c00e1841a3533a35d279285af3a51 upstream.

The exit condition to quit iterating over the sg_list, while encoding
the sg entries, has to consider the case that the dma_len of the entry
could be zero. This patch takes this condition to account.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220402232744.3622565-4-m.grzeschik@pengutronix.de
Cc: Dan Vacura <w36195@motorola.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik 2022-04-03 01:27:44 +02:00 committed by Greg Kroah-Hartman
parent db11d8c72a
commit 738515cf8b
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/function/uvc_video.c
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@ -126,7 +126,7 @@ uvc_video_encode_isoc_sg(struct usb_request *req, struct uvc_video *video,
sg = sg_next(sg);
for_each_sg(sg, iter, ureq->sgt.nents - 1, i) {
if (!len || !buf->sg)
if (!len || !buf->sg || !sg_dma_len(buf->sg))
break;
sg_left = sg_dma_len(buf->sg) - buf->offset;